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adam-rl
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Mar 11, 2026
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| // Count blocks that will be overwritten (rewritten) | ||
| uint64_t rewritten = 0; | ||
| auto check_it = mapping.lower_bound(m); |
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So this is in the hot path, serving block reads, and we've introduced another lookup.
Should this be somehow gated with a preprocessor guard, and only enabled when building the overlaybd-commit tool?
adam-rl
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Mar 11, 2026
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Could we instead have this method return how many blocks were removed?
This code is already figuring out what was overwritten, it can just report that.
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Address PR feedback to avoid performance impact in hot path: - Add ENABLE_REWRITE_STATS preprocessor guards around all tracking code - Eliminate duplicate overlap calculations by having remove_partial_overlap return rewritten block count via output parameter - Add CMake option (defaults to OFF) for building overlaybd-commit with stats enabled This ensures the production hot path (block reads) has zero overhead from telemetry tracking unless explicitly enabled at build time. Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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